Method for determining at least one characteristic parameter of a component of a DC converter by way of an electronic computer device, and electronic computer device

Abstract

A method for determining at least one characteristic parameter of a component of a DC converter for an on-board electrical system of a motor vehicle by way of an electronic computer device includes determining a first transfer function of an HV/LV DC converter based on a small-signal model of the HV/LV DC converter, determining a second transfer function of the DC converter according to the first transfer function in such a way that the DC converter has at least one characteristic substantially identical to a characteristic of the HV/LV DC converter, and determining the at least one characteristic parameter of the component of the DC converter according to the second transfer function.

The invention claimed is: 
     
         1 . A method for determining a characteristic parameter of a component of a DC-DC voltage converter for an on-board electrical system of a motor vehicle by way of an electronic computing device, the method comprising:
 determining a first transfer function of an HV/LV DC-DC voltage converter based on a small-signal response of the HV/LV DC-DC voltage converter,   determining a second transfer function of the DC-DC voltage converter depending on the first transfer function such that the DC-DC voltage converter has a property that is substantially identical to a property of the HV/LV DC-DC voltage converter, determining the characteristic parameter of the component of the DC-DC voltage converter depending on the second transfer function, and   adjusting the characteristic parameter such that the property of the HV/LV DC-DC voltage converter is adopted by the DC-DC voltage converter,   wherein the HV/LV DC-DC voltage converter and the DC-DC voltage converter are each provided as bidirectional DC-DC voltage converters, such that the DC-DC voltage converter is able to be used in a highly flexible manner within the on-board electrical system of the motor vehicle.   
     
     
         2 . The method according to  claim 1 , wherein:
 the characteristic parameter is determined such that the DC-DC voltage converter has a step response that is substantially identical to a step response of the HV/LV DC-DC voltage converter.   
     
     
         3 . The method according to  claim 1 , wherein:
 the characteristic parameter is determined such that the DC-DC voltage converter has a Bode plot that is substantially identical to a Bode plot of the HV/LV DC-DC voltage converter.   
     
     
         4 . The method according to  claim 1 , wherein:
 the HV/LV DC-DC voltage converter and the DC-DC voltage converter are each provided as a full bridge.   
     
     
         5 . The method according to  claim 1 , wherein:
 the HV/LV DC-DC voltage converter and the DC-DC voltage converter are each provided as electrically isolated DC-DC voltage converters.   
     
     
         6 . The method according to  claim 1 , wherein:
 the characteristic parameter is a value of a leakage inductance as the component of the DC-DC voltage converter.   
     
     
         7 . The method according to  claim 1 , wherein:
 the characteristic parameter is a value of a duty cycle as the component of the DC-DC voltage converter.   
     
     
         8 . The method according to  claim 1 , wherein:
 a transformation ratio of the HV/LV DC-DC voltage converter and a transformation ratio of the DC-DC voltage converter are taken into account when determining the characteristic parameter.   
     
     
         9 . An electronic computing device for determining the characteristic parameter of the component of the DC-DC voltage converter for the on-board electrical system of the motor vehicle, wherein the electronic computing device is configured to carry out the method according to  claim 1 . 
     
     
         10 . A method for determining a characteristic parameter of a component of a DC-DC voltage converter for an on-board electrical system of a motor vehicle by way of an electronic computing device, the method comprising:
 determining a first transfer function of an HV/LV DC-DC voltage converter based on a small-signal response of the HV/LV DC-DC voltage converter,   determining a second transfer function of the DC-DC voltage converter depending on the first transfer function such that the DC-DC voltage converter has a property that is substantially identical to a property of the HV/LV DC-DC voltage converter,   determining the characteristic parameter of the component of the DC-DC voltage converter depending on the second transfer function, and   adjusting the characteristic parameter such that the property of the HV/LV DC-DC voltage converter is adopted by the DC-DC voltage converter,   wherein the characteristic parameter is determined such that the DC-DC voltage converter has a Bode plot that is substantially identical to a Bode plot of the HV/LV DC-DC voltage converter, such that the DC-DC voltage converter can be used highly dynamically even for transient processes within the motor vehicle.